Nice looking game
But the controls are terrible. The to double tap dash really gets in the way. I can't believe how many times I try to feather the directional to make a slight correction, only to accidentally trigger the charge attack and miss my target by a mile, something that could have been easily discovered with a few play-tests.
Ignoring that, the are a few issues that need to be improved on.
Other than controls, the biggest issue is that the game is too generous in rewarding lives. You only need to collect 25k points per life, which may seem like a lot, but it's really easy to farm points. Since the pop combo is only reset if you touch the ground, it is often better to fall into the void and get thrown back up (and into a wave of enemies) than to touch down. Because of this, it's pretty easy to reach the maximum number of points per pop (5k), and at that level, it takes a mere 5 kills per life.
Because of this, maximizing your score becomes a game of grinding points, rather than technical skill and dumb luck. And the place to grind for points becomes world 7, which has flat (like level 1) rather than tiered (level 3) terrain, slow land enemies, an an endlessly spawning "prawn" enemy that like to throw themselves at you. With the right level layout, you can actually just spent most of your time killing these until you time out, then when you respawn, charge into the void to the left at the beginning of the level to keep your combo going.
On deaths, there are two ways in which you can be cheated out of an extra hitpoint. For instance, whenever you are tagged in the air, you recoil back. And if you're unlucky, you'll land at the very tip of a platform, and the momentum from the recoil will push off into the void before you can even do anything. The other can be done by using a charge attack after having fallen into a void, and have been launched in the air again.
Another big thing that bugged me is that you can only gain one bonus hitpoint per pop combo. While it's possible that this was done intentionally as a way to challenge players going for points, it seems highly unlikely, considering how easy it is to leech points.
But even with all of that, it's still a really cool looking game, the music (while forgettable) sets a cool mood, and its actually kind of fun to play once you get past the controls.