This is a lot of fun! About the only thing I might suggest is to add something to indicate that E works for interacting with switches, at least on the first one. I might just be a bit dumb, but it didn't occur to me to try that and I was a bit confused for a moment. It also may be a good idea to add some signposting in the last world that there's a second exit. It's really easy to get lost and end up right back where you started and assume that's it for that one.
I hope you'll consider adding a downloadable version of the game, too. I'd love to be able to play offline!
