Thank you for such detailed review!
Yes, you're right, the yellow thing is supposed to indicate the speed of the weapon (the bigger the value is, the faster you charge the attack). I'll definitely improve the UI in future updates.
>Is it bugged?
I suppose not. Poison dagger should apply poison when you either charge your attack to maximum or you attack within the "crit" range (the red field on the charge bar). The effect is also barely noticeable tho. I'll check it anyway.
Glad to hear you liked it!