I might add powerups, but I'm not sure about that. I don't see a reason to punish the player for spamming since (at least in my opinion) it doesn't take away from the experience, but I'll probably incentivise aiming and charging shots by making shots that the player waits a bit before shooting do something as TheCalster suggested. As for the last point if you're talking about the collisions (or lack there of) that was fixed in the most recent build (release? (upload? (version?))).
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In the most recent version the intervals between spawns decreases over time so that should make it more difficult. I'll try adding new enemies later in the game next time I get a chance to work on it.
P.s: glad you enjoyed it.