Hello!
I loved what you did here, Fox. A creative approach to platforming with a lot of challenges. You're getting really good with visual communication, I can tell you're using some good techniques to communicate state transitions, like squash and stretch for jumping. This really upgrades the overall visual feedback of the game.
I think your major strength is the visuals, though the sound effects also match the internal game events like the jump and stomping. Your art style is simple yet meaningful: the frog actually jumps, there's a clear visual distinction between blocks you can pass through and ones you don't. Overall, great!
I would add some incentives to make players want to stomp the enemies and something to measure players' progression. With that, you would have a solid game to distribute for a casual audience.
Something like: each "floor"/platform gives you 1 score point and stomping enemies could give you coins to spend on new characters. Or even experience to upgrade skills, like double jumping or jump height.
Talking about jump, I realized you implemented a wall jump, right? But it doesn't work smoothly. Do you have access to the book? There's a Wall Jumping Character recipe that could definitely fix this and make this entry a solid infinite jumper. I'd bet some success on mobile with it and if you managed to add some rogue-lite features, definitely a solid product for Steam.
Here's my play session: