Very good game
It was a very cool idea to combine pokemon and tower defenses. Just a few things Id like to add.
-Some moves are useless when you capture the pokemon, such as harden (only one I came across), but I think ratatta has a speed up ability, dont know. They serve no purpose as of right now once using them to defend. Maybe make it that you can be the attacking squad a few times, or give them a different ability once you use them to defense the rare candies. Maybe harden can make pokemon stop and try to attack the hardening pokemon.
-More variety. I know the early routes don't really have a lot of pokemon, but maybe try to include others such as Mankeys, Nidorans, spearow, I think theyre all available during the earlier times.
Other than that, its a really fun game. Also, to anyone having problems with viridian forest, I passed it while using 2 pidgeys, a kakuna, and a metapod. I had the bug types use stringshot to slow the bug type down, and I had pidgeys leveled enough to use Gust, it will pummel them. The pikachus however, are a different story.