Hopefully, we manage to optimize the animations and add more/new settings for better game performance in the start of the upcoming week! Thanks for reporting this!
Trial of Air level 3 can indeed be solved. I just did it after many, many tries. The key is to place blocks on the right two white spaces first before placing blocks on the left three white spaces.
Why not just finish the last five levels and then upload the game? It seems like you want users to keep checking back on the game, which increases the amount of game plays, which increases your ad revenue. Or, it could be done to have the game be part of the August monthly contest. Either way, release the complete game.
Underpass Square Man seems to be the best in the beginning-middle stage of the game, but it has a tendency to run into monsters often. I am just going to focus on upgrading him.
After you have maxed out everything, put all of sentry units around the ship(should be more than 20). Then purchase max missile ammo and go above your base to meet the enemy in the field before they reach your ship. Run around in circles to have the enemy also run in circles, while shooting them with missiles. This will help you complete the wave faster than staying at your base, providing you with time to repair ship in-between waves.
 "BlightBorne"){kind=icon}
 "Area Raiders"){kind=icon}
 "Block Invaders"){kind=icon}
 "Eternal Fighter"){kind=icon}
 "Hasty Shaman"){kind=icon}
 "Super Ordinary Joe"){kind=icon}
 "Warrior's Journey"){kind=icon}
 "Square Man Idle"){kind=icon}
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It would be too easy that way. Cursed shot is the only skill that can pierce the last boss.