Could be fun if you put some more puzzles and make them a litle bit more logical.
+ I think there are 27 triangles... (YES, I took the time to count them...)
It's really a great game great graphics but... Yeah I'm one of those who likes to gives critics on everything... It's slow, sometimes you need more than 10min to complete a level, it wouldn't happen if your energy rate could go up or if you could have a retreat button. (Units are much stronger when they're attacking in numbers). Also it's EXTREMELY REPETITIVE... The only thing that change is the number of enemies spawning and their weapons. thanks for reading.
Level 17 is one of the easyiest... You just need to give it some energy when it's expanding,
the difficult levels are the one where you need to fight 1 color... =(