Finished with a score of 214500, while I spawned 10 waves at the same times ! Was a fun experience trying to figure out the cost of the upgrade / the cost of the merge and which is the most worth at a time ! Lot of potential, maybe in the upgraded version if you merge the same tower it grants a buff or a boost to those towers ?
As a fellow Tower Defense game jamer I found your game really enjoyable !
Good work keep it up !