Stumbled across another great free itch.io game just now:

Platformer. Left/right arrow keys move, spacebar jumps, and after a few screens, you get the ability to possess in-range enemies by pushing the Z key. It takes a bit of getting-used-to since the main block enemies won’t let you move when you are one, so you have to make sure to trigger their movement and then possess them so they carry you safely past spikes. Also, the only other enemy type (the moving circles) will kill themselves and you if they touch a wall while you are one, but everything else about the game is responsive and intuitive. The level design also has a lot of tricky jumps while still being fair. Highly recommended. You can play it here: https://lightpotato.itch.io/parasitism