[PC, Mac, Linux] 20th Eelyear Platinum Collection (10 DRM-free games by Digital Eel) US$1 (~ A$1.35) - itch.io

This is my first submitted deal post on OzBargain :)

To celebrate Digital Eel's 20th Eelyear, and to help show our sincere gratitude to all of you, we're making ten of our computer games available together in one fat DRM-free package for just $1.00! We can only offer the 20th Eelyear Platinum Collection for a few days so act quickly, and tell your friends too.

Some of these games do not seem to be available for purchase online (e.g. not individually listed on Steam or on itch.io), so this limited time only collection may be the best option to obtain these games in the foreseeable future.

Plasmaworm (Windows 98, Windows XP)
Plasmaworm is an easy to play - but hard to master - arcade game for all ages. It is a modern relative of early computer games such as Snake, TRON Light Cycles and a rare gem called Pizza Worm (DOS). Plasmaworm featured two player modes, adversaries, weapons, complete customizability and level sharing.
NOTE: Plasmaworm won't run on modern systems. You'll need either Windows 98 or XP, or OS9 (possibly OSX).

Strange Adventures in Infinite Space (Windows, macOS, Linux)
Explore the galaxy … in 20 minutes or less! Strange Adventures in Infinite Space was the first space roguelike with an additional twist: short and brisk rather than lengthy and tedious roguelike play time. Strange Adventures was an Independent Games Festival 2003 award nominee.
NOTE: Community created mod packs are included

Big Box of Blox (Windows, Mac OSX)
Big Box of Blox is a column stacking game taken to outrageous extremes! Exploding blox, squishable blox, one-armed-bandit blox, transforming blox — you get the idea, and there's so much more. Big Box features five different games and a custom game setting all wrapped in Bill Sears's supercool game art.

Dr. Blob's Organism (Windows, Mac OSX)
Blast feisty one-celled organisms before they getcha! A weirdly cool twist on "Tempest", Dr. Blob's Organism harked to arcade games in the 80's. It was based on John Conway's Life. Dr. Blob's Organism was an Independent Games Festival 2004 double award winner.

Weird Worlds - Return to Infinite Space (Windows, Mac OSX, Linux) - currently priced at $7.50 AUD on Steam
The lunch break roguelike of interstellar adventure! Weird Worlds expands the Infinite Space universe with more of everything and features more rare and dramatic end games. Weird Worlds: Return to Infinite Space was an Independent Games Festival 2006 award winner.
NOTE: Community created mod packs are included

Soup du Jour (Windows)
Rubbery, bouncy, rule-breaking gameplay with physics to make you laugh and surprises in store. Making candy soup looks easy until the kettle starts to roll and boil — but the candies keep coming. Not to mention the kitchen gremlin with his bombs, licorice missiles and giant candies — don't spill it!

Brainpipe - A Plunge to Unhumanity (Windows, Mac OSX) - Steam link
A psychedelic Zen-inducing arcade trip! Brainpipe: A Plunge to Unhumanity is an easy-to-pick-up first person game of real-time spatial navigation and quick reflexes with hypnotic graphics, ear tickling sound effects and immersive dreamscape music. Brainpipe was an Independent Games Festival 2009 award winner.

Data Jammers - FastForward (Windows, Mac) - Steam link
Racing and destruction in a retro wireframe world! Data Jammers: FastForward is a continuously moving three dimensional driving and destruction game set within a retro wireframe world of impossible race tracks. Prowl twisting bitstreams amidst bizarre geometrical environments enhanced by otherworldly soundscapes!

Infinite Space III - Sea of Stars (Windows, Mac) - currently priced at $7.50 AUD on Steam
The space roguelike series that started it all continues! Sea of Stars is a starship roguelike; a fully randomized sandbox adventure game of interstellar exploration and combat featuring full 3D space exploration. Sea of Stars was funded by the gaming community!

Protagon VR (Windows) - currently priced at $7.50 AUD on Steam
Pinball meets mini golf in zero G virtual reality. Protagon is a hybrid casual game designed from the ground up for the SteamVR experience. It blends concepts from mini-golf and pinball with an intuitive VR interface. Each "hole" introduces new twists, odd-stacles and game mechanics to keep up the challenge.
NOTE: Protagon requires an HTC Vive virtual reality rig to play.