Really glad you liked the game! ^^
It actually is possible to beat every level without losing any units - otherwise I wouldn’t have left the level designs in lol. Some of the later levels are pretty finicky, notably levels 8 and 10, but they’re all possible to get perfect scores on ;P
Can’t deny the lack of sound effects though. I was also planning on adding more unit types, like one that’s immune to turrets but has only 1hp against everything else, but time got the better of me and I had to reduce scope lol.