Hey, I really love this game and the updates it's had so far, so I'd like to address some issue/bugs that might help further improve the game, and give some optional suggestions I'd like to see considered.
Bugs:
There is a bug that will softlock you in mewtwo mode if you go into the MISSING door. (also with mewtwo mode, this may be intentional but the levels are often different, and the display for the opponents moves also mirrors your own even if they have a different moveset)
I had a few instances where foul play/brine don't actually buff the damage of the move when it should.
Text wrapping is sometimes offset. (I've seen this occasionally with spamming z/x and once where the text just got jumbled in the middle), most of the time this is just 1 character/space off
Some of the descriptions don't match. This is really just semantics but it is weird that some mons also have 2 of the same ability while others have 1 ability and one "none". Really just pointing this out for consistencies sake.
Suggestions:
More stuff. I'm a big fan of stuff. Whether that be moves, abilities, mons, mon forms, trainers, types, etc. I'd love to see more mons also taking advantage of their signature characteristics too. I understand how this is probably like one of the hardest things to do from a dev standpoint, but I'm very appreciative of any extra content. (also I love all the easter eggs, would love to see more of those as well)
More balanced mons. I know that a lot of this is supposed to be unbalanced as you get better mons as you progress, but there are many mons that just don't have any utility on a team and I hate to see them squandered. The multihit moves especially are pretty weak for the AP cost, and the damage it lists on the move doesn't align with the damage it deals (more significant than just rounding). Also I believe this is intentional, but high rarity mons that evolve can bypass the item balancing by feeding them before they evolve. This is fine to have, but it means there's no reason to run weak mon over smth like ttar.
Cancelling evolution. I think this was already suggested, and maybe there's already a method I'm just unaware of, but a pikachu with item boosts can be much better than a raichu. There's a few other instances, and this could be a cool challenge to run as well.
More items/held items. A rare item to turn a mon into it's shiny rainbow star variant could be cool. I also think the premise of having small buff items in battle could make it more interesting, like the arceus plates/1.2x boost items to buff a specific damage type, berries, or maybe even something like weakness policy. So long as the AI can also effectively use them, it should just add more options to the game.
Harder difficulty. I know there is the battle frontier and mewtwo mode, but once you learn the game you almost always have an abundance of health and it's not too hard to beat oak on almost every run. The mewtwo battle definitely requires more planning, but I'd much prefer to have a gamemode with more rounds/higher level cap, and stronger opponents. If this means an update to the battle frontier then I'm all for it. This could also be a sort of nuzlocke variant where you only have 1 life and can't use items. But I do think more rounds is very necessary, you don't have long to really get attached to and grow your team, once you get mons to lvl 7 you really just sell the slack and commit to 3-4 powerhouses. I also don't know if ledgendaries can appear in runs, but after about 20 wins or so I've never seen them in shop, but a rare chance for them would pair well with longer runs.
Tutorial/FAQ section. A lot of it is intuitive if you've played this style of game before, but more information is always nice to have, especially for beginners.
This is an amazing game with a ton of potential. I'd like to thank you for the ability to play it (and play for free :D). I only hope the direction taken for this game remains positive, and I'm excited for what's more to come. Many thanks and best of luck in development.