Cool game. I like how you used to ponds as checkpoints. Not a fan of the key mashing. It would be nice to hold down to move even if it was slower than tapping. I ended up 2 handing my arrow keys for more rapid presses. I liked the all-surface platforming, that was very interesting. I think some of the level design became a bit repetitive, but overall it was fun to navigate. I got worried in some parts where you can fall down to earlier checkpoints, I ended up suiciding off the right side so I didn't have to climb again.
Becoming a snail was a funny twist. I would have loved to see the snail's movement abilities become more important, with levels designed specifically for the new mobility, but jams are gonna jam right lol
Good job overall!