Hey, I watched you playing my game on stream so I have a pretty good idea of what your playthrough was like. It's true that the enemy bumping can be somewhat inconsistent, I think most of the time this may be because of the angle of your inputs compared to the enemy, but I feel like there's more notable inconsistencies with certain enemies in certain areas. I will be looking into this further. It is also true that enemy placement in levels could be improved.
I think if the enemies were to slide off of the stage on their own, the game would become less challenging overall. I remember watching your playthrough, you would constantly ram into enemies to try and get them off. This is not the ideal way to deal with enemies. The idea is that when your blast attack is not available, you should not approach them aggressively and focus on dodging them. If you dodge them efficiently near an edge, you will have a window of opportunity to bump them off yourself. This is not your fault as the tutorial in its current state does not do a good job at teaching the player ideal enemy interactions and is also unclear about certain mechanics such as Blast Attack. This will be addressed. Right now enemy interactions include your basic bumps and the Blast Attack as options. I agree that there could be more ways to defeat enemies. Something I'm considering is being able to bump enemies and making them bounce off walls as another interaction method.
Thank you for playing the demo!