Full game loop, appealing graphics, shop mechanics. Well done for a beginner entry! I bet you learned a lot, keep doing these!
Some changes that would make this near impossible to put down:
- More sound effects: Swipe, Hit, Coin Pickup, Footsteps, Dash, Zombie growling, Zombies dying
- Screen flash on taking damage
- Juicy particle effects: Pickup up coins, dashing
In your next jam, go small scope like this again (but you'll do it faster now), and then focus on adding "juice" to the game as described above. This takes the game from beginner to advanced.
Overall, very nice work! Give my entry a shot!