Did you check with MSI Afterburner, Special K or likes about your useage or fps?
This is likely the reason (and
my post following for solutions).
See above and
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or
this.
I don't think its that hard actually. Sure not everything works out on the first go, but if it would be too easy it would be boring. And for those still troubling there is level skip, keys for faster movement ... and my
table (which you can use to take your time with the game).