I do not know if the developers will read this, but ...
MAKE A SEQUEL !!!!
preferably one with a longer storyline so we can keep playing for a long tim!
1- everithing is too big in a tiny screen. when an enemy comes into screen he's allready in front of you and the bigger enemies can ocupie the whole screen
2- the enemy can start firing and moving even before coming into the screen, so many times you don't even kno where the damage is coming from
3- the debris created from a destroyed enemy are so big and bright that sometimes you can't thell them from enemys and from power-ups
4- power-ups to small and come too often
5- in the end you still have the same week and small enemies from the beggining, but they start to come in huge numbers and the game start to get slow. make stronger versions of the those enemies for the end
6- if I save enought money to get the last weapons I get absurdly powerfull and the game starts to become kind of boring.
7- PLEASE make it possible to build while paused
it's a good game,really. lot's of fun in the beggining, but starts to get problematic in the 3rd cenerio. just needs some improvement!
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Working on it :)