This is a Bullet Hell vertical Shmup made by Famibe No Yosshin (the same guy who did Red Ariyama and Zacner series).
In every level you need to shoot at enemies and fight the level boss in order to advance to the next level. Red squares are shooting upgrade, but at some point I decided to stop collecting them since the next upgrade would have been an annoying laser. The laser can be replaced again with the previous weapon by collecting another square, in case you collect the umpteenth square mistakenly.
The more you advance, the more it gets tough, of course.
It's a cool shmup, it doesn't even look like a basic code game, since movements are so smoother.
Enjoy my video and stay tuned for an arcade coin-op gameplay!