Firstly, brilliant game, most enjoyable. So refreshing to find some colourful, arcade FUN!
I tend to play on easy and can reach about 1.3m (only a few hundred thousand on normal and even less on hard). I can't help but feel that I should get that on normal, and easy should just be for pure fun and no worrying. I always end up getting to a point where I get hit so much I lose my weapon power-ups and then continuously struggle with inadequate firepower. It seems odd to me that you have to effectively play the game perfectly (i.e. not get hit) in order to keep your power-ups and thus progress. It does add some drama to the game, however!
Of course, it could simply be that I am not very good

And I realise that with a joypad, it might be easier. However for me I think movement is definitely best with the mouse. Just an analogue control for firing would be helpful, rather than having to move into the most effective position, not always convenient!
So please, if any of you more seasoned players have any tips, they would be most welcome. I feel like I'm not maximising my enjoyment and I don't want to get disheartened! My thanks in advance and I eagerly await!
Is there any chance of making it open source in any way? I would love to have a look at the code so I can tweak it myself (purely for my own interests, of course).
Thanks for such a great game though. I look forward to all future releases!