I've played a lot on my phone, hit infinite multiple times on ladder and conquest. The game is not free and it's very exhausting.
My insights:
1. The game is not optimized for mobile, while using the mobile framework on PC. I get 5 or 6 crashes every hour and the dev team either is so lost that they don't know where to start or they just don't care. I have sent multiple reports on Discord and ingame to no avail.
2. Series 5 cards are too frequent and intentionally power creeping older cards, making f2p players unable to compete in the meta.
3. Predatory bundle pop-ups.
4. Season pass exclusive cards for both Premium and Super Premium - remember Fantasticar?
5. AI art scandals.
6. Missing Series drops?
7. Event Pass rework, a great value package ruined for no apparent reason.

But also:
1. The Marvel Snap Store in browser is a great deal, with daily log-ins and promo codes with credits and Variants.
2. Fun gameplay loops, distinctive archetypes. Something for anyone.
3. As a casual game, great.
4. Fun with a friend, interestingly fun draft format (not official).
5. The energy system is a fine resource system, however cards built on it inclusion makes the gameplay very distinct.

I don't care for the Marvel IP, I'm here for the gameplay. I've had great times playing this but as of last year - abysmal.
I can't help but laugh at the fact that a mobile game is not optimized for mobile. Honestly I would still play if I could on mobile.

actual micro transaction cancer from hell. ben brode got me once with hearthstone . NEVER AGAIN.

I've spent more time playing Snap than any other game in my life by far. My Steam hours don't even come close to my time on mobile. I'm disappointed to see negative reviews that don't accurately represent the game. This game is free to play, free to win, and most importantly, free to judge for yourself. Don't be misled, Snap is a fantastic game with a bright future. Whether you want to hop in for 5 minutes or 5 hours, you're going to have fun with it.