It's an awesome game. However, it's WAY too easy the first couple of sectors, and it has some gramatical errors. But I can ignore that. What bothered me most, however, was a glitch that was overseen. If you complete the game normally, and equip the ultra-gun, and restart the game on hard mode, you will keep the ultra-gun, making the game easier on hardmode than on normal. It is also not possible to unequip it until you have beaten it again.
Final thoughts: Gets a bit repetetive when the same dialogues repeat, but it is kept fresh by the higher tier weapons. All the bosses are killed in the same way, and the only boss with a weakpoint is the final boss. I would suggest fixing the ultra-gun glitch and getting better bosses, as in not every single boss is killed with the same strategy. Also make it possible to kill the final boss without the ultra-gun to add more challenge.
All in all, it's a great game that pushes me to keep going. Thanks for this game, good work and good luck on your next game.