I like this game a lot, but it has some issues, and the ads are a bit too much. it's not a problem for people a little better but for beginners you end up with a 30 second ad the 3rd time you die and a 5 second one every 3 times afterwards, which is just too much if you can't get passed 4 levels or so cause you're only getting like a minute of gameplay.
there's also a glitch that makes it so the ball and chain dropping is just completely impossible sometimes. the levels are randomly generated, and after 20 or so you can get the extra element of a conveyor belt and a short ladder which can be very difficult. in general some of the levels are just way too difficult, and it definitely seems like a design issue. for example your first level can be a cannon with the block, which with the inconsistent reaction time of the cannon is very difficult compared to the other levels you can get for your first 10. then once you get past 20, you can get a ghost on the conveyor belt with a short ladder, which is VERY hard, sometimes impossible I think. the way it's timed makes you jump just before the ladder and miss it, then get stuck having to jump backwards on the conveyor belt and dodge the ghost 2 more times to time the ladder jump right. this is just clearly poorly tested.
frustrating to hit glitches and bad design, but fun if you get lucky