Its a solid game, I like the upgrades and am overall pretty satisfied with the gameplay. The webs are more of an annoyance then an actual menace to your well-being and the lasers feel a little slow. Other than that its a nice little game and I personally enjoyed it.
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Thanks for the feedback. I have fixed most of the issues in the new version that I have uploaded now.: I made a normal viewing angle with a laser (for this I had to add a physics engine), made a normal purchase of items and fixed the error with the inability to buy all the panels and lasers (By the way, when you wrote the comment I was playing your game :-)