I'm sorry that I couldn't provide more movement beyond A/D. Kept it simple to emulate some shoot-em-ups with more restricted movements.
As for the firing and alternative controls, I originally was considering A/D + Left and Right, same for the firing mechanics. Due to time constraint with the goal to achieve simplistic, I settled for what I thought is conferrable. Even earlier an idea of swappable controls was considered but too much stress and so little time made me scrap that idea altogether.
You do made a good point having separate buttons for firing and charging. I'll look into refining that in future titles if I do it again. Personally, firing could've been toned down better and firing does come off clunky. >u
Lastly, although I considered web build as it is possible to do, but it might run into audio problems if there's any. That wasn't tested before publish so again, I've stuck to what works. Extra click and time sure but at least it's portable haha.
I thank you for taking the time to try out this game and your insightful feedback Mcfluff! It's nice to receive detailed feedback despite the imperfections. :)