This is what a retro game is. When I say that, I mean it has the look and sound of retro, but also the feel of it. Since my computer can play it without any problem or slowness, it obviously only has as much data as it needs to have to be a retro game. Most games like this move so slowly on my computer I wonder exactly what it is about the game that's causing it, since there's hardly anything to look at. But this one was smooth and fast, and easy to enjoy. At one point I just decided to go back and forth between screens to get powerups until I was full. It was cool that I could do that, but also it took a little bit of grinding.
The only thing that wasn't too great about it was the length. Perhaps a little bit more grinding could've added a stronger sense of accomplishment at the end. Not too much, you never want a game to get boring or repetitive. Like if it took twice as much purple stuff to get another powerup. And earning special attacks would be interesting. Maybe if the last stretch were longer and had one extra boss where you got to control the giant one while escaping. Maybe one small robot your size that is as powerful as you and you have to beat it before getting to that boss.
Overall, it was decent. Good way to leave off for a second game.