I put about 20+ hours into Monster Train on the PC/Steam Deck late last year and ended up picking it up again on iOS. It has me hooked all over again.
If you've enjoyed games like Slay the Spire in the past for deckbuilding rougelikes, it's perfect to hammer out a battle pretty quickly. The main difference is each level is like playing three battles of Slay The Spire since there are three "lanes" that the enemies move through. It has enough depth and replayability that you can go for quite some time before burning out.
Plus, you can add googly eyes to every character/minion in the game and I can't not play with that option turned on.