Not gonna lie, it was difficult to discern the instructions due to the colors of the text of the background. A panel behind the text would help.
The rocket not being animated in the slightest looks strange. Could help to animate the flame a tiny bit. Even mirroring that part for the second frame could help. I also had to force-close the game to escape the tutorial ...
The minimap was a nice touch, even if a tad unoptimized. I think rotating the rocket according to the direction it's moving would have helped a lot in making this game look more cleanly programmed.
Red background for hardmode. Nice.
If you were to iterate off this, I'd say adding a radar that detects things a certain distance away from the player would go a long way.