Great little game. I believe this is my first Pico8 game, and I can definitely see the charm in the system. The game itself reminds me of both the cave parts of Link's Awakening and many Rare games like Solar Jetman and Digger.
It struggled a bit with telling scenery from platform, spikes from walls etc. (this coming from a guy whose LD46 entry is made to look like a NES game). Looks like you've adressed those things in the post-compo version. Great experience all in all.