Nice idea. I'll say as someone whose played twinstick shooters the controls didn't bother me. I actually thought the game was too easy even on the hardest difficulty once you know you can grow two plants(actually even more if you place them right) at once which was one of the first things I tried I never ran out of ammo. I also never saw a reason too and didn't understand if it even did more damage to use the shotgun. I played up to 100 kills and then just tried to let myself die and even that took a very long time with how much health you have. More enemy types / boss rounds would definitely push this up. And as others have said the map makes it seem like you can only plant in the middle 3 lines which is confusing if your allowed to plant anywhere.
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Thanks for playing! Glad the controls weren't too tough (and also that I'm not totally crazy regarding the difficulty lol). Overall (especially with health and invincibility after getting hit) the game's fairly forgiving.
I was able to beat the game on the hardest difficulty on my first try, but yeah without more enemy types it's hard to have it be properly tough without being just unfair. I mostly prioritized features other than new enemies because I was more interested in coding waves and an upgrade system and such.
The shotgun deals a little more damage, but is mostly useful because it can hit any number of zombies in range at once, and pushes them back to give you space if you get overwhelmed.