Thank you for playing! I'm glad you enjoyed the wisps and the tutorial.
Good job on getting all the achievements! Wow!
About the timing for the chain explosions, I was debating if I should add a text exposing the exact timings and relation between the bombs and the dragoon running speed or letting the player learn it through trial and error while playing the game. In the end I didn't have time to go back to this and just left it as is.
You already cleared the game, but if you want to know: the time it takes a dragoon to move through a grid square is the same as two chained explosions, or said in the other way, you get 2 explosions per square walked. With this information, you can count how many squares the dragoon will need to walk to reach the interception explosion point and then count how many explosions are in your chain. Then use both numbers to calculate how much you need to wait before lighting up the first dynamite in the chain.