That was a lot of fun! Perfect scale of game loop and progression for a jam game. The loop of discovery, then upgrading and being able to discover even further is really satisfying and fun. Also a nice way of tying the theme directly to the core mechanic.
The level design hits the balance of looking good while also forcing you to use all mechanics, and gives some intriguing looks at places you will be able to access later with upgrades. That is very tricky for a short jam game, great job.
Very impressive work - especially considering you did it solo.