Nice first level with good ideas. My recommendation is to think about the several ways you have to push B to fall down and go to the win so players can miss parts of the level, for next one... Thanks for sharing!
Yet another new member to welcome! I would suggest scaling back a bit and working up to something more complex. Right now, there are a lot of shortcuts B can take to avoid all those clever traps you set. Spoiler They mostly have to do with sliders that reach the ground. B can very easily jump down, run around the outside of your level, climb onto those sliders and walk a few short blocks to the win. So I'd challenge you to find ways to close those easy-exit paths. There are also some slider joints suspended in mid-air attached to nothing that I'd erase just to tidy up the look. But there is a ton of potential here, so keep at it!
My B won by missing 80% of the level and no exploits were used. @chemi knows my route based on comments. Spoiler: Shortcut At 1:02 (in your movie), my B fell off the landing as the slider pushed. B went straight to the ending. BTW, welcome to the forum.
@Don G Rowe Even with your screenshot, scanning the code didn't worked as is (not your fault...). I admit that this code is blurry so without zooming on it or using tricky methods it will not be easy to make it work. I have now another solution which uses the customizer from http://mekostudio.com and just generate the code (without any other modification). That gives you something like that: Spoiler: QR Code It worked in many cases where the app didn't managed it. Well... on that case the code was too much blurry so it didn't work without a zoom on it but then the result still clear. Now @caovanphu, about the level: As your first level I think it's a wonderfull one! Not difficult at all but with some traps to be carrefull about and a really nice design. Of course it could be improved but that's a great achievement indeed. I would have noted 4/5 but as you were very collaborative in customizing the title I add one more star Thanks!