QubicGames have been simultaneously celebrating their 16th birthday as well as raising funds for COVID-19 relief.
For the next few days, Party Treats is being offered for free to owners of Geki Yabba Runner Anniversary Edition or Robonauts (both games have been free or heavily discounted in the past).
Owning either of those 2 titles also unlocks some steep discounts for other QubicGames titles - of which a % will also be donated to COVID-19 relief.
Keep in mind you won't find a Celeste or Dead Cells amongst their offerings, but may find some intriguing titles on their own merits.
I recommend Blazing Beaks personally. Akane could be fun for high score chasers and REKT has a lot of content if you're into the gameplay (always look at gameplay first).
Thanks for the reminder, I just grabbed Blazing Beaks for $3 as I already have some games from these guys.
Qubicgames homepage has the full list of games and discounts https://qubicgames.com/16th-anniversary-sale/