That is what I've done for the past few days, yes.
If you want to play for more than 10 minutes at a time, then sure. But TKCD isn't the sort of game where you need to continue playing for hours on end. You can easily pick it up, then put it down and wait for a recharge. Battles take less than a few minutes, and you can usually get around 3-4 battles in per vigor splurge.
I think it's executed incredibly well. Again, this isn't the sort of game where you need to play for hours upon hours. The vigor bar makes it so you can't sweep through the game all at once, which is something I feel should be commended.
Let's consider the alternative for Team Kirby Clash Deluxe. Let's imagine that it wasn't a F2P; that instead, it was $8.99 or something. There would be no need for a vigor bar, so the game goes by very quickly. Gem apples would either be very easy to obtain or done away with entirely. Armor upgrades could be obtained incredibly easily. What you're left with is a slightly longer version of Robobot's subgame, akin to Dedede's Drum Dash Deluxe. This, in my opinion, would be a travesty. I bought DDDD, and it was incredibly underwhelming. It didn't feel like a fully fleshed out game; just the same thing from Triple Deluxe with some new songs. I loved the original, but DDDD felt like I was spending 1/4 price of a good game for 1/35 of it's content.
If TKCD had done this, it would have been a game that you could clear in maybe an hour or two. A waste of money, in my opinion. The way it is now, it forces you to play the game over a longer period of time. Plus, you're only spending money when you want to, so you're not wasting any money.
Even though I've barely been able to play this game for more than 30 minutes at a time, I've still been having a blast with this game, and I wouldn't want to play for more than 30 minutes at a time. Not for a small game like this. For a full $40 game, sure. But for a slightly larger subgame? No.