Loved this one, great mechanics, well polished and variety of enemies and upgrades keeps it fresh.
The lazer beam enemies were a bit op as they can target you before they're within sight, that and the upgrades outside of micro rockets and speed didn't seem to make that much of a noticable difference. Also seemed like the big boys could only be damaged by hitting their wheels.
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You get upgrades quite frequently, so while a single upgrade might not make a big difference, once you get 2-3 upgrades of the same type it definitely makes a big difference.
The big guy's hull is immune, yeah, so you have to go around and target the 'wheels'. I did that to try and avoid every enemy being killed just by bullet spam :P.
Thanks for the feedback!