It looks promising, but also very glitchy.
Good story and graphics, the sound was okay too.
There is no in-game tutorial except for the training mode, which is actually just a few pages of instructions. If you are going to introduce a bunch of unconventional controls, it's better to do it through gameplay instead of forcing players to spend a couple of minutes reading just so they can understand what is going on. And even after reading the instructions I still had trouble figuring out how things work, something that may or may not be due to glitches.
In some screens, you press space to progress and enter to go back and in others you have to do the opposite. The projectiles you fire follow you left and right instead of flying straight and if you fire again, they will disappear and respawn in front of you. When an enemy is hit the screen turns white, this can get very annoying. The level codes don't seem to work or at least the first one. The first boss was fun after I got used to the controls but I gave up on the second one, it can only be damaged by missiles and the amount you get from the shop is only enough to take out about 1/4 of its health. Even then, I decided to grind a little on the first level and give it another try so I chose 'new game' and it sent me to the second level again. I also found out there is no way to abort a mission without taking a lot of damage first or just reloading the game.
It's an interesting game, but it isn't worth going through all the glitches. It is difficult, but mostly due to hard to navigate menus and generally bad execution rather than challenging levels.