I get an error trying to play your game. I am using NoScript for security reasons, but despite temporary enableing all content for this page, I still get the error.

I would test you game and give some feedback - but not by first buying it, sorry :)

Nice idea.

First I'd like to suggest any type of menu to start and end the game. You will need it later anyways. In that menu you can also have some options for players to change the control for ... flapping(?) ... to another key. For example I'd like to use the space bar to relieve stress of my hand I am using my mouse with. At least have a hint what to do after starting the game. :)

Next would be interaction feedback. One guy mentioned a sound effect. It makes the button more fun to press. You can see this guys video for some ideas: 

Well, keep it up! Depending on what and how much work you put in, that can turn out well.

It’s quite a fun game!

I’ve thought of a few suggestions, but they all depend on how big the scale of the game should be. As it is now, it’s a fun small game, which is complete, so you can leave it as-is. If you want to add more to the game, here’s some suggestions:

• When I started the game, I lost a couple of times before I understood how to play the game. Not sure what’s the best way to solve this, as the game is designed to be moving fast. Maybe in the first few seconds, the game runs with a slow-down, so the user has the time to look around and understand what’s happening?
• I really think the spikes and the walls should be different colours, or in some way be able to tell them apart from each other. I understand that the game is using minimalistic design, so adding new colours is not that simple, but it took me a few times to figure out what’s hurting me and what’s helping me.

Well done for completing a game! That’s the hardest step of game dev!