Thanks for the feedback, all good ideas!
Controls: they are supposed to be on number keys, not on numpad. I do need to have a proper intro that would present all control options.
Updated enemy art and a music track are both in the works! And I completely agree with the point about telegraphed attacks - that is indeed my plan, along with adding more random events and explaining the existing ones properly.
As for the difficulty - this information is very valuable right now, I've been tuning and re-tuning it back and forth recently, will be sure to take all that into consideration while working on next updates!