I fell into the void :(
I like the structure of the game, impressed with how you put together the different areas which all felt pretty unique. It gave the game a nice sense of exploration, I had the feeling of wanting to discover all the masks and their abilities...
I myself was trying to create a game with a similar exploration vibe, and I even wanted to do the masks = abilities thing but had limited time to do that so instead went for just polishing the basic combat more.
The cactus guy was hard to kill! I almost gave up there. After I got the balloon mask I didn't know which direction to go from that upper doorway, that's how I fell to my doom!
Great job overall, biggest critique is I didn't hear any sound or music at all, that would have added a lot.