I spent 1000+ hours on ITB and if you liked ITB you will also like Metal Slug Tactics.
It has more game element than ITB and eventually you will spend more time on calculation compared to ITB. They are reasonably balanced and fun to explore.
I may be biased as a fan of both Metal Slug and turn-based tactics but this game is pretty awesome. There are some gameplay quirks that take time to get used to, but it makes sense once you get a hang of it. It simple on the surface, but there are many ways to approach team building and selecting abilities/weapon loadouts and upgrades. On the highest difficulty you’ll have to get pretty efficient with actions and combos to win, so the game isn’t boring even you get good at it.