No real tutorial or explanation on anything leading to an unintuitive experience. Needing to bring up the right click menu (right clicking not being something usually used in submitted games due to limitations of some formats like flash bringing up the flash menu) which isn't mentioned in-game so that you can place the turrets you have already purchased is not intuitive at all. Needing to read through the description to identify a right click menu existed in the first place due to it not being shown in the game is a major oversight. Even upon knowing the right click menu exists placing turrets still needs you to mouse over the small window for the turret type to place them which is finicky and if doing it during combat leaves you unnecessarily vulnerable due to not being able to angle your weapon while placing the turrets.
In terms of the text. There may be a full screen option but the smaller / windowed option shouldn't have text too small and cluttered to read. The font style and size makes reading anything difficult when in the base window.
Needing to run over coins to collect them is tedious, annoying and wastes either time spent doing it or the money if ignoring doing the tedious act. As it currently stands for free online sure, selling no.