Ghost wrath

Game has 4 levels and evil BOSS in the end. Controls: move by cursor hit by A,S. It's on Russian, but you don't need to know it to play. If I know English good then I'll make English version. Take a fun.
You say level 4 is hard, so you need help. Here is the tips:
1.Blade traps appears from blue blocks
2.Enemys that slide forward-back: if you kill it when it's speed is about 0 it will appear with the same speed(without moving).
3. Press A,S not with same time. You can hold it to continue slash.