The idea is fine and randomizing turrets has a lot of potential, but I think it's too easy (maybe due to the fact, that enemies come out one at a time in huge intervals), so at the wave 10 or 11 all I need was 3 heavy-hitting slow-shooting turrets at the very begging taking care of everything :)
But I believe that after some tuning it could be a very good game ;)
Viewing post in RTD Tower Defence jam comments
The difficulty balancing was the hardest part due to the towers you get being random. Some towers make the game too easy while others would struggle. The spawn time between enemies gets reduced in later waves with the final wave only having 0.5s between each but I think you’re right about the slow spawns in early waves.
Some further balancing of towers is definitely something I’ll be looking at in the future. Thanks for the feedback!