The Forgetful Cube is the first game I have ever finished. Being so, it is not that great of game. It is a 2D platformer about a Cube who is 'running out of space' in my brain. He can only remember so many skills at a time or he will start to forget past one. It has some Metroidvania like elements such as finding new abilities and allowing you go backwards to find secrets rooms. Be sure to explore levels carefully because many levels have secret rooms you can find. WARNING: this game has bad programmer art. I did use some art made by someone else, so it isn't all bad.
To the point that I could play, I enjoyed the story and how it was told. Otherwise it was mostly a solid platformer, although the level with all the cubes is somewhat difficult to get past because it seems like if you take the bottom path you can't jump up high enough to get to the door?
One relatively trivial piece of feedback I have is that the "next level" door says next level even when it takes you back a level. I guess "next" is somewhat meaningless in a branching game but it still is a little strange.