Really great little game & kept me entertained for ages :)
I did run into two small bugs though while playing though (neither major),
with the first & main bug it seemed that if I saved right after a mission but before purchasing any of the 'main weapon' upgrades then die in the next mission (even right away) I would re-load with both the upgrade & the amount of money I saved with?
I have tested this a few times & even started a new game & have maxed/gotten all weapons quickly both times although it doesn't seem to work on the 'Miscellaneous' upgrades (it does work with buying new weapons though),
this isn't so much a bad bug & maybe even worth leaving in for if people get bored although once I had all the weapons/upgrades I got bored fast :(
& the second bug I got twice was just the tank not being visible on the scree when I started but then I died & restared & it made no difference lol