I know 2* but recommend, hold up. The base gameplay loop is fun, you'll have fun for like 30-60min. But the meta progression is really bad.

The upgrade costs feel a bit random and there's new weapons and abilities scattered just around and you get new weapons will little fanfare. Also, somehow these new weapons don't change the gameplay loop at all, so the game does get boring. I got to the end of the first level, but couldn't quite bring myself to slog enough upgrades to finish. spoiler The end of the level btw there's no more gravity (the fun part of the game), just you duking it out with some blocks.

Would've given it 3/5, but it's a nodebuster upgrade tree with nothing unique or interesting in that department and I'm tired.