Dynamite Jack is a nice, albeit rather short, Bomberman-style game.
Personally, I really enjoyed playing through the campaign: most maps are indeed quite easy, but if you want the experience to be more challenging you can just decide to try and get all the secondary objectives on you first try, instead of coming back to collect them one at a time.
This, opposed to just going for the exit, does make the game more rewarding but doesn't really increase its longevity: you will probably get to 100% completion in about 7-8 hours tops.
Still, for me this wasn't really an issue, better an "honest" short title than a game that drags on and on with pointless objectives and impossible achievements.
Also there are many community maps, so if you really like the game you can keep playing it even after finishing the campaign.
As far as the price is concerned, if you like this kind of game I'd say it's worth it; with a coupon you can even get it for 1€, and that's a steal in my opinion.
- pleasant design.
- levels last a few minutes, making this the ideal choice if you don't have much time.
- getting all the achievements is not an impossible task (quite the opposite, actually).
- really fun if you enjoy this kind of game.
- some mechanics could (and should) have been exploited more; for example the "spiders" which appear in the last couple of maps in my opinion deserved to appear more throughout the game, they make the maps they're in much more challenging and interesting.