either add markers or zoom out, so i can ALWAYS see whats below me, otherwise jumping on a tanker or even a car ends the combo unless you are really lucky
in the last level start commiting seppuku until the spawn point is filled with corpses, then new animals will be instantly crushed by the lack of space and your lifes will quickliy diminish. But wait! its not game over if you run out of animals, your lives will go into negative, which means you are creating an army of zombie-kuties. The ending screen is the same, but you can guess what happens if you piss off a whole zombified zoo. (at -18 lives the level auto ends, so dont overdo it)
nice realization of a single-multi-player game. You could probably get interesting statistics from this, like exponentially decreasing population. Or by checking which obstacle/level segment killed the most players, automatically generate levels that are easier or harder
the memory management is totally screwed up, it requiers more and more the longer you play. After the first 5 levels (about ten minutes) everything went into slowmotion whenewer i shot enemies with chainlightning or when there were a lot of bullets (which made it easier to dodge). After beating 5 more levels everything froze because this little flashgame claimed 1.3 GIGABYTES of RAM for itself
it takes 4 clicks to upgrade a unit! i have a keyboard and i want to use it, also buttons for closing all the popups and starting a new wave. And im missing an explanation of all the skills, ok "slow by x%" is self explaning, but wtf is consecration steal or gold return?
stacking more then 10 bombs doesnt seem to reduce the cooldown further. Still, bombs and magnets is a cheap (in both sences) way to beat most (non-boss) waves
if you are already autofilling zeros you could as well autofill 9's (im looking at you, last level). Add undo button (and not just a single step). Add save feature(totally necessary for bigger ones). Give hints every few minutes instead one at the beginnign
the hard part about the switch mode, is that you often fail to see that a game activates. Could you make the frame blink the moment before it activates
why should someone bother getting the achievement-coins after buying the first upgrade for 6? since you can only equip one and cant change it midgame there is no point in buying the others