Simple and fun, It kinda reminded me of that little "Tanks" game on the Wii mixed with Smash TV, the fact that you can shoot through multiple ennemies is really satisfying, overall i'd say it has a good game feel in general, i also liked the little falling animation when you go in the wholes to go to the next level.
It's a bit hard and could use some re balancing though i think, the ennemies 's bullets are a bit fast.
Other than that i's quite good :)