Really neat little game! I have some minor feedback if that's okay:
1. the lvl 20+ dragon upgrades seem to bug out (both desktop & browser). it just gets greyed out and not interactable.
2. The parallax seems a bit strange, I feel like the far mountains should barely move rather than move with the foreground and the mid ground moving faster than both, the current setting gives this odd feeling as if the mountains were sliding around instead of an illusion of perspective.
Thank you for making this game, good luck with the Steam release!