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I'm just posting this in case it helps another newbie out.

I was really confused as to why I was flush with cash but had nothing to spend it on. Well, I learned this by accident: you can increase your guns' power (costing more each time to upgrade) by using the right arrow, or decrease it (and get some dough back) using the left arrow.

Looking again, turns out there's text on the bottom letting players know that, so I'm just massively oblivious. OH well. :P

Before this I was using F2+F3+F6 occasionally to toggle invulnerability; hopefully it won't be as necessary now.

(Now I wonder if there's a way to re-play levels.)
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