Just started playing on v2.2.0.0 and as much fun as the game is, it feels like there are some.. major imbalances (and some minor annoyances).
For starters, it might just be me, but it feels like the game has a MASSIVE first turn advantage. When going first as the player, you can basically just pass, see what the opponent plays (without fear of taking damage, since they can't attack on turn 1), and then draw whatever you think you'll need to counter whatever they played. There's absolutely no incentive to commit to anything as the starting player on turn 1.
And then whenever you're forced to go second, there's an almost immediate sense of urgency; if you play nothing, you risk taking massive damage, but even if you do play something, you can't actually attack, you're just mitigating potential damage. The CPU can then easily respond to whatever you've played. You're basically on the back foot from the start of the match.
As for my minor complaints, of course, it's about the Tribute and Evolve events. At the beginning of the game, Tribute doesn't seem to do anything (visually). It seems there's some hidden "potential" mechanic, that makes it so the Pokemon receiving the tribute will have boosted stats when it levels up, or something? The description doesn't really explain anything, and at level 1, usually neither Pokemon's stats will visibly change.
Evolve appears to be similarly useless at lower levels. Some Pokemon don't even gain any stats at all when evolving at level 1 (or 2!). This seems counterintuitive, considering the cost of evolution, compared to levelling up (and of course, how evolution works in the games)
In both cases, there's no indication of which stats will increase (unlike when leveling up, which clearly displays how their stats will be modified), or even IF they will increase at all. This hidden "potential" stat, related to Tributes, seems a bit too nebulous for a game that doesn't seem to have any written guides or a wiki?
Overall, I love the concept, but the execution leaves much to be desired. I hope some of these issues will be resolved in a future update.