Thank you for your feedback!
I agree difficulty is the main issue here, specially the more enemies on screen, however I do not think jumping to the mouse would fix it (if anything is a game changer), you would have to be faster to where you aim with the mouse, its easier to press a button than to move a mouse plus now rather than sliding to go down you could jump anywhere; at the same time if the screen is full of enemies and hazards its the same deal, jumping through it feels like luck or that you have to take a hit sometimes. And if someone does not have a mouse or uses a gamepad it becomes all the more tricky.
Spawning and limiting the right amount of enemies at certain times is the way to go imo without affecting the base we've built. HP pickups and a bit of aim-help could also help.
And I hear ya on the mobile version!