I personally found the game in terms of mechanics and gameplay to be a little messy. When the difficulty is not high, the game just feels rather slow (and when the difficulty was high, I could barely even stop the ships and ended up losing).
The RNG aspects of the game were also not very organized. The things they changes (apart from the speed boost) felt like aspects that should come naturally as the game progresses.
Also, you should be really careful with how you use RNG to hinder the player. Using it to add difficult elements is fine, since it's still possible for the player to get better and move past them. But taking away 25 points for simply getting the number 4? That's too harsh and just frustrating - There is nothing the player can do about it.
Overall it's pretty ok, but there are definitely things you can improve