Wow, thanks a lot for the review and the encouragement!
I take note on the issues you mention. If I allocate more time to the project (which will probably depend on my morale after reviews, but your comment is quite encouraging!), I'll probably take all your suggestions into account. Some of the issues aren't by design, though, but because of time constraints. The most important is that, as you say, the game doesn't have a real goal other than toying with the exploration. While that enough generates some fun and satisfaction (like you encountering yourself!), I know that it's still missing most of it. Sadly, the time hit me hard, and, as you also said, the project was quite ambitious (as hours passed, I noticed that it was too ambitious!), so at one point I needed to sacrifice a lot so I could actually send something.
In order to climb more effectively, one should use the checkpoint a lot, with "p" (to put it) and "i" to return to it. It's written on the poem; I hope that in my desire to make it funny, I didn't make it unclear.
Thanks again for the feedback, and for playing the game!