I think you've got a great game controller, you should keep it and to a longer game with it ! It's really satisfying to use !
The game itself has a few problems, that are actually minor because just grappling around constantly is sooo fun... Let me list what I've noticed :
- When you need to survive a level, waiting for one whole minute to finish is really long ! I think that with less health and a shorter timer it would be more fun
- After having a few levels where you need to wait, having one where you have a boss to hit is cool, but needs to be more advertised, I spend a lot of time before noticing that I had to hit the enemy and not dodge it
- The features like jumping or jumping down ledges are not really useful, you could just remove ledges entirely, rails are enough for level design. What I'd like to have instead of a jump is the ability to stop the grapple before I reach the end point (or maybe it's already there and I missed it ? It would not be the first time I don't read instructions properly xD)
Again, having a mechanic that is fun to use by itself is pretty hard, now make the best game you can around it !