Hi, while playing the game i found that was impossible to complete some levels because of a cursor bug, where the grenade is not place on the cursor location but a little bit higher.

To fix this issue by changing the game resolution to 1336x768,playing in window mode and making sure you have some free space below the game window for the cursor to travel, is possible to place the grenades in spots that you couldn't with fullscreen and max resolution.

https://youtu.be/Z2I8dM-Urps

I hope this guide help you finishing the game!