Pretty fun game. I've beat this thing about fifty times by my estimate. I've found a few glitches in my many playthroughs.
- After receiving the "double jump" powerup, you can infinitely jump by jumping into a ceiling and rapidly pressing the "jump" button. I've found that this glitch helps one go from the "double jump" powerup, to the room requiring the "wall climb" powerup to traverse, and then to the "wall climb" powerup without having to take a detour.
- Using the "shrink" powerup and falling to the left of the leftmost mushroom in the second room right of the three spike pit room causes the PC to move to the room left of the screen, but above the ceiling and out of bounds.
- The four "heart" powerups disappear often and the only one I have found to appear consistently is the one requiring the "shrink" powerup.
I highly doubt this game will receive an update as it was created just for a Jam, but I thought I'd state them for the record. It's a great game and I can beat it in less than 10 minutes now with a fairly optimal run.
Edit: Turns out if you jump high enough against the wall in the same room as the out-of-bounds glitch with the "shrink" powerup activated, you enter a room with a couple platforms with the castle tileset. You can only run around half the left half of the room and crossing into the right causes you to be transported back to the mushroom room. I can only surmise that this is a dev room of sorts.