Amazing. Just astonishing!
The graphics are beautiful! I really love the very low resolution of this game, which allows for a very nice pixel art sprites, that seem very detailed, and oddly realistic! The effects add even more to the appeal, things like falling leaves, water reflections, falling snow, splashing magma, and even more, create an image of a living, breathing world! I also like the variety between the regular, mountain, and the underground terrains. Each of them differ from the others, both visually and practically, and feel very unique, which is a great plus!
The music, is really well done! Each of the three terrain types, have their own tracks, fitting for their feel, yet keeping that same leitmotif. They don't get irritating at any point, and they are really nice to listen to, also kudos for actually composing the music for your game! Other sound effect, while not as good as music, still keep a very high level.
The gameplay is pretty simple, it's basically a regular platform game, that I think can be classified as Metroidvania. You don't only move left and right, you also need to climb up the maps, and go down, to access other parts of the map. The layouts of all of the sections, are well designed, and thought out; at no point have I felt lost, they have been well balanced, and despite map being open ended, I always knew where to head first. The controls, also have been programmed well! They're fluid, and give a feeling of a total control over the character. I had no issues with them, so much so, that whenever I died, I always felt like it was my fault, and not game's!
I am truly amazed, by the quality and polish of this game! As of writing this comment, this has to be the best game on this jam that I've played, I had no issues with it, and I enjoyed it greatly!