Thanks for the review! I hadn't considered the pickaxe that way, since it's definitely the most tedious tool. I guess that's a balance to consider.
The inconsistency of graphics styles is because different people were working on different things (I worked on the terrain, and a different person worked on the gate and the fog). Next time we'll make sure to maintain a consistent style, possibly by having only one person do the artwork.
Sorry you had trouble with the level. I don't think of any of us have written a platformer before, so we're still new to level design and thus the levels aren't perfect. In addition, we were planning to implement procedural level generation but ran out of time, so we didn't spend as much time on hardcoding levels as a team that was planning to hardcode levels from the beginning would have.
Glad you were able to enjoy the game despite its shortcomings, and we'll definitely keep your feedback in mind for future games. (We might even use these reviews to make improvements after the voting period and share the updated version.)