Several open source games using Heaps.io are available, here's a few that can be used as examples and learning:
A top view 2D pixel puzzle game with some post process filters
A top view 2D action game, not tile based
A 2D pixel platformer
A strategy game (using mouse UI) with some platformer involved
For more samples of Heaps usage, people published source code for their jam games:
- Deepnight github for samples of games based off GameBase template.
- Cherry-jam repository with several jam entries including 3D games.