Good and challenging
i really like the challenge on how you have to arch the bullets and determinig where the rockets would hit... (and the spelling for defence/defense i know a lot people who actually spell it both ways because we can't decide on how to spell it since they're both right....)
Its a great game but needs upgrades and the ability to add sentry for defense and diffrent gun mods like explosive rounds, acid rounds, etc, etc.
Fun, but challanging
Pretty good range of enemies that spawn at a pretty good rate. I'm also a big fan of the art style.
I can't tell why some people are getting their balls in a knot about upgrades, all upgrades ever did for me was distract from the actual gameplay.
It needs upgrades
I think the external balistics should behave a little more realisticly, and it needs some sort of upgrade. You cant make a game succeed unless it has stuff to upgrade anymore.