This game shows promise! I like the art style, I think I get the design philosophy, and if you are going to follow in the footsteps of another game, then Hollow Knight is a good game to pick.
The most glaring flaw is that you do not have an actual healing system per say. This is...interesting to say the least, considering that it seems like it should be in the game, due to the presence of all the watermelons everywhere that seem to do little at all except for filling up that meter at the top. Because there is no healing, you are forced to make it through each section with 5 health drops, which wouldn't be a problem except for the third area of the game really ramps up the difficulty, mainly by introducing these bombers who hone in on you and you have to take the hit, and the lack of checkpoints along the way. An unrelated point is that there seems to be no titles for the other stops that you can go to via the warp pads, and also you can skip meeting the friendly monster entirely, which makes his reappearance in the second world where he's calling you "friend" rather abrupt to say the least.
However, all of this aside, I do believe that you can, and should, develop it into a more fully-fleshed out game. Rework some of the enemies, or just don't use them completely. Maybe put the dash in the game as the first item you collect, as this would make combat a lot more tighter and more easier to design interesting enemies around. Just a thought.
But anyways, really good art style, level design, and music! I'm impressed, speaking as somebody who can't even run unity, to think you put this all together in 3 months.
Keep it up!