Matchmaking is tricky because if they split the player base too much then the queue times will be too long and it'll be frustrating for people. I don't mind the way it works, but I would like to see more modes and ways to play. Hopefully this is something they will introduce down the line.
The developers have already confirmed that more skins will be coming for animals. There's a poll here to vote for the next animals that get skins: https://forum.partyanimals.com/d/38-vote-now
I think people are overacting to the skin shop, it has the same monetisation as most other games out there. In fact, it's much less aggressive than some of them. To be fair to the developers, they even have Ori, Naru and some other IP Collab skins that are free to get with cookies. They could have easily charged for these.
Of course the developers are going to want to make more money so they can keep working on the game down the line. Everything that costs Nemo Bucks is OPTIONAL and for cosmetic purposes. There is no pay to win, so I really feel that the skin shop is fine as it is. They need to keep making money.
That being said, I do hope they will increase the level cap from 100 and introduce more rewards and ways to earn Nemo Bucks and Cookies.