i hate other reviewers in newgrounds
this game was a lot of fun and much like you said it starts easy but then gets harder. however, it isnt impossible to beat. you almost make it too easy for the fact that the right strategy and quick hand will cause victory. PLUS, you give cash for losses and unlimited continues.
newgrounds idiots want to blame a game maker for program not working in their config. SCREW YOU! upgrade f**kers! also, dont give low rating cuz you arent good at games.
anyway, great job. simple, but good graphics and gameplay. music is cool. i look forward to updated versions.
MY GUIDE FOR WINNING
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for the record, my guide to winning is to max out base weapon ASAP. next, save up for the 2nd shield. max that out.
next, buy super thumper and max out as you go along.
as you fire on other enemies, switch to thumper when loaded and strike, then back to regular gun. you can get two rounds of this in which kills an enemy or two and then use shield (it'll be charged by then). continue attacks this way.
as boards get harder, buy new bunkers and do same weapon lineup. when all three bunkers are done, buy mini nukes, cuz they load faster.
i also HIGHLY recommend EMP after this to destroy any incoming fire and nukes (it works really fast).
the game is not hard at all with this combo. you may run outta time and draw on some boards, but you will BARELY lose.