Other than the levels 12, 14, 17 bugs (I treat them as bugs) already stated by someone, pretty easy brainless game that is surely not a puzzle game, but like a spot-the-difference game rather.
Great graphics, yet bad gameplay. First, levels should be treated independently. It is not a good idea that keeping dying on previous levels makes later levels harder to complete. Second, the timer is unnecessary. Third, when go back to previous completed levels the latest amount of remaining lives and bombs carry over but not the previous amount. This should not happen.
First, save my progress. OK because this is just a preview or demo or whatever it doesn't need a save, fine. But second, jumping through narrow holes in a row in the last part of level 3 really piss me off. Third, the countdown at the bottom is unnecessary. 3/5.
This is more of a platformer than a puzzle game. Plus, it's not hard to beat the game. So, I expect more puzzle-style gameplay and more challenging levels.