enjoyed it. even though the thumbnail and the title screen irked me a bit, im not too disappointed in this concept. although you probably do need to make the bat invincible when he dashes and have a set cooldown for such a skill (i mean show it in the GUI lol). or maybe make it a power-up? either way it's probably better than taking a shot in the dark and hoping that the bat won't disappear into space-time (yea that's what happens when you hit an object while dashing)

spikes are spikes, and coins are coins. they don't serve any purpose but to provide difficulty if you do intend to dodge them and collect them respectively. now obviously i'm going to take it as you're going to expand on them during later versions of the game. (the coins i mean not the spikes) oh yea, pretty minor but it won't hurt to add a high score board. either way, nice game